Grinding-wheel.



H. B. NICHOLS. GRINDING WHEEL. 111111111011 rILnD P11113. 1910..

H,B. NICHOLS; GRINDING WHEEL. APPLICATION YILEIJ EELS, 1910.

Patented Feb. 21, 19111.`

z Sums-SHEET 2.

85y of adj ust-ment.

AI 0 similar portion Referring the mYlble' clamping Platel carriedon UNITED sTATns PATENT onirica.

seeoieanon of Leners Patent.

Patented` Feb. 21, l.

.Applicaticn filed February 3, 1910. Serial No. 541,851.

To alw/Lom 'it may concern:

13e-it known that I, HENRY B. NICHOLS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia 5 and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-W heels, of which the following is a specification, reference bei-ng had-therein to the accompanying drawing.

ing and cutting by means of abrasives, and has oritjs object the'produc'tion of a grinding body' in which asrelatively large per cent. ofthe abrasive material, maybe usefully employed, with arelatively small per cent. ofwaste. 7 i

An additional object is the provision of means and the l method of operation for maintaining the surface speed of the grinding body approximately consta-nt, In grinding Wheels especially, the constant wear at the cutting edge, by constant reduction in thev dlaaneter, produces a corresponding varia' tion in peripheralspeed.

thatv o fconstantly feeding or advancing the material pf the body toward the cutting line to compensate for wear, and in the embodiment which I shall-herein describe, I make' 3 0' a lgr'indingwheel of separate sections, which en the wheel is new are in immediate contact with each other, and 'are interlocked along radial lines, being held by clamping 'plates which can he After Wear the separate blocks or sections of the wheel are by Ipnovingjthem out from the center, and the resulting-'radial interstices arel filled with special interlocking bricks made for the pur- 40 pose. After the Several sections have become so ,worn as to be useless, the filling bricks, :having parallel edges, although Worn can still be employed for other wheels.

M yfinvention is illustrated in the accom@ 45; panylng drawings, in which,

l igure 1 1s a side view of a new wheel. Fig, 2 is apradrant thereof with-1 parts ,y broken' away, ig 3 shows aportion of `a wheelafteroneadjustmenn Fig. 4:' shows a after two adjustments, Vand Fig. V5 'is a diametral section ofl Fig. L

first to Figs. 1 and 4, the wheel, as a whole, is "designated byW, its s indle as S, the ,xed clamping plate as plate as P', lThe a ilanged sleeve p,

My invention relates to the art of grind The principle involved in my invention is' opened for the purposes andadjusted 'ing nut N, having a left hand thread, in

order to avoi'd any danger of its being nnscrewed during rotation of the wheel.` The plate P has set into its inner tace along radial ribs p0 extending from the sleeve ring to its periphery, a set of projections fr', for a purpose presently to be described; .and both plates l) and I .are concaved on their inner faces, or provided with peripheral flanges p2, for the purpose ot' insuring a tight grip en the Wheel sections.

Referring now in particular to Fig. l, it. willbe observed that the wheelisections w, w', wg, w, etc., have their adjacent edges interloclied on sinnons lines of radial direction, as indicated at zo# This mutual cn- 'the teeth on its opposite edges, which are intended to resist the action of centrifugal force, each block or segment is providedto54 and enla rgenlcnts fw at intervals along its length. The channel fw is to serve as a guide in adjusting, and receives rib 79 of plate l, and the enlargements 'o1-,transverse `chambers w are to receive the projections ,v on the rib, Wh ich thus afford additional security against the action of centrifuga-l force.

with a radial channel 16 wheel, and i't will benioted that there are eight. sections or blocks originally making up the Wheel, all locked together by' their toothed edges 'and clamped between the plates p, lin. i

The dra-wings herewith are taleir from a The wheel thus complete is used inthe ordinary manner, the surface rspeed. for which itis designed being 6,000 per minute, -or 1581v revolutions per minute. The rst use can safely continue until the edge has been worn down-about l or to within about if of the edge of the flanges p2 on the ,clam ing lates. 'The wheel is then sto p'ed, un ocke by loosening thev nut. N, andJ the bricks or segments w, w', fm2, w", etc., are moved out in'- radial directions into the 4positions shown in Fig. 3. It will be observed that the transverse --enlargenients w in the radial grooves, also the proyections p on the fixed p ate P, are set lf centers. Each enlargement, therefore,r enbetween gages the next projection in order toward y ent case, prefer to usc a very thin rubber the circumference of the plate, the outerl packing.

most recess in the brick lying outside the periphery of the plate indicated at wm.

In moving the bricks out from the center along the line of the radial grooves, they obviously separate, and in the case of a 16 wheel with eight bricks, this first separation amounts to lf; Or to lr over the ends of the teeth. The interstitial space due to this separation I lill by' inserting a special, long, narrow brick marked B,

' .'having its edges serrated to match the rations in the main Wheel segments, but parallel in their general direction.

, y1lavingset the segments and inserted the bricks B, the plate P', is again set up against the wheel by tightening the nut N, after Whichthe edge must usually be trued up somewhat; but this is a tritling operation, involving the removal of material. 'to a maximum depth of only about 53g, Which is done very quickly. The Wheel is then ready for 'further use.' After being thus reset, When the wheel a Vsecond time becomes .Worn to the permissible limit, that is to say about it from the peripheries of the clamping plates, the bricks are again reset, as shown in Fig. 4. The operation is the same as before, but it will be observed that eachbrick or seg-l ment-s now so worn that only two of the transverse recesses fw remain, one of which lies W1th1n the perlpheries of the clamping plates, and the-other Without. In this second resetting, l,the se ents. become .separated by an interval o 2%, and this space is lled by another size of special brick shown in Figs: and marked B. This brick is similar to the brick B in that it has parallel serrated edges, and is inserted in the same manner. Theplates p p being again clamped together on the Wheel; and the circuxnference brought to a true curvature, fur-,

Aimmediately apparent upon iguring dimen sions.

After the Wedge-shaped segments lw `w are entirely Worn out the bricks B and B are still of use, and can be employed with new segments-or in another Wheel. Besides being slightly coneaved, or flanged at p2, so as to grasp the bricks iirmlynear their outer edges, the plates l? and P are pro.

vided .with a cushion of some yieldingsubstance, such asblotting paper. In the pres ln addition to the great economy effected by my invention a very ,important advantage gained is that of being able to run the wheel at practically a constant speed. -The maxilration) being lo, the minimum diameter is never less than i3-, hence very little variation in the surface .speed is produced by the 'tireur permitted between adjustments.

lt will be apparent to those skilled in. the art that numerous changes in matters of .des tailv can be made vrichout departing from the principle of my invention, and without sacrifice of the essential features thereof. Thus, the matters 'of the radial channel w,

etc., are all subsidiary features, and so long as their functions are performed by equivalent elements they may be changed Without altering the invention. l believe myself to be the first to produce a successful Wheel of this type, and- I shall therefore claim the same broadly, desiring it to be distinctly understood that I contemplate all variations I claim and desire to secure by Letters Patent of the United States, is:

l. A grinding Wheel composed of radially adjustable segments, means for maintaining continuity of the eripheral surface of the means for clamping the same when adjusted, ,whereby Wear may be compensated and a substantially constant grinding surface maintained, substantially as described.

2. A grinding Wheelcomposed of radially adjustable segments of abrasive material, means for clamping the same when adjusted and abrasiveg'members illing the spaces between the segments due to the adjustment,

face, substantially as described.

3. A grinding Wheel composed of separa- 'ble radially adjustable segments of abrasive material, vvvith interlocking means upon their edges, radiaL-llers With complementary interlocking means 'on their opposite edges, and clamping means for the segments and iillers, substantially as described. v t. A grinding Wheel composed of separable radially adjustable segments of abrasive material having serrated edges, radial fillers havin complementary serratlonsin their opposite edges, and clamping means for the 'segments and fillers, substantially as. de-

scribed.

material, abrasive fillers for the inter-segmental spaces, a spindle for the wheel, a. flanged the serrated edges wt, the locking means,`

and departures from my present disclosurev which fall fairly Within the scope of the* Having thus described my invention, Whatso as'to preserve a continuous grinding surmumpdiameter (for the size taken as an illus- Wheel for all positlons of the segments, and

5. A grinding wheel composed of separa.-A l i ble radially adjustable ,segments of abrasive i plate fixed on said spindle, a parallel plate `movable upon the spindle, and means for forcing the plates together so as to clamp the wheel segments and fillers in position be tween them, substantially as described.

6. A rindng 'wheel 'composed of a plurality o `separable adjustable Wedge-shaped segments7 in combination With bricks having parallel edges, said bricks adapted to be inserted so as to ll the interstiees between the segments after their separation by radial adjustment, the edges of both brlcks and g segments being provided with cooperating Interlocking means, and clamping plates adapted to hold the segments and Jbricks together' as a unitary mass With a continuous grinding surface, substantially as described.

7. A rinding'wheel composed of alternate Wedge-s iape'd segments, and bricks with parallel; edges, in combinationy With clamping means for holding the segments and bricks together as a unitary mass, substantially as described.. 1 v

8. A grinding Wheel composed of radially adjustable segments each having a radial vchannelwith a plurality of chambers or re- `cesses in its face, a plate with radial ribs adapted to lie in saidehannels and projeetions or studs on each rib to lie in the said' recesses, and a complementary lateadapted whereby the segments are properly alined in adjustment and held against displaement 'by centrifugal force'.

ln testimonv whereof I affix my signature 35 in presence of two Witnesses. y

y vHENRY B. NICHOLS. Witnesses:

Gao. B. TAYLOR, CHAs. V. Lommer.

30 tofelamp the segments against t 1e first plate, 

